It does boot pretty fast, even without the tricks Vista plays with flash memory. I've used and played with Macs a lot before, but this iMac is the best of them all, definitely better than any Windows box (and even better at being a Windows box than my other Windows boxes).
Is your UPS plugged into the Mac via USB?
I do have it set up on USB. I do not have Vista and will not get Vista. I am comparing it against an XP box.